Facebook has banned extremists including Louis Farrakhan, the leader of the Nation of Islam, and right-wing conspiracy theorist Alex Jones for violating its policy on hate and violence.
The company said it has also banned right-wing figures Paul Nehlen, Milo Yiannopoulos, Paul Joseph Watson and Laura Loomer, along with Jones's site, Infowars.
The latest bans apply to both Facebook's main service and to Instagram and extend to fan pages and other related accounts.
Facebook previously suspended Jones from its flagship service temporarily and this suspension has been made permanent and includes Instagram.
Facebook says the newly banned accounts violated its policy against dangerous individuals and organisations.
The company says it has “always banned” people or groups that proclaim a violent or hateful mission or are engaged in acts of hate or violence, regardless of political ideology.
For years, social media companies have been under pressure from civil rights groups to clamp down on hate speech on their services.
Following the deadly white nationalist protests in Charlottesville, South Carolina, in 2017, Google, Facebook and PayPal began banishing extremist groups and individuals who identified as or supported white supremacists.
A year later, widespread bans of Jones and Infowars reflected a more aggressive enforcement of policies against hate speech.
It is not clear what events led to Thursday’s announcement. In a statement, Facebook said: “The process for evaluating potential violators is extensive and it is what led us to our decision to remove these accounts today.”
Facebook has been under heavy pressure to rid its service of hate and extremist content. Last month, it extended its ban on hate speech to prohibit the promotion and support of white nationalism and white separatism. It had previously allowed such material even though it has long banned white supremacists.
Asked to comment on the bans, Mr Yiannopoulos emailed only: “You’re next.”
Jones reacted angrily on Thursday during a live stream of his show on his Infowars website.
"They didn't just ban me. They just defamed us. Why did Zuckerberg even do this?" Jones said, referring to Facebook chief executive Mark Zuckerberg.
Jones called himself a victim of “racketeering” by “cartels”.
“There’s a new world now, man, where they’re banning everybody and then they tell congress nobody is getting banned,” he said.
Mr Watson, meanwhile, tweeted that he was not given a reason and that he “broke none of their rules”.
“Hopefully, other prominent conservatives will speak out about me being banned, knowing that they are next if we don’t pressure the Trump administration to take action,” he wrote. –AP